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/**
* Plugin that automatically truncates the plain text contents of an element and adds an ellipsis
*/
( function( $ ) {
// Cache ellipsed substrings for every string-width-position combination
var cache = { };
// Use a separate cache when match highlighting is enabled
var matchTextCache = { };
$.fn.autoEllipsis = function( options ) {
options = $.extend( {
'position': 'center',
'tooltip': false,
'restoreText': false,
'hasSpan': false,
'matchText': null
}, options );
$(this).each( function() {
var $el = $(this);
if ( options.restoreText ) {
if ( !$el.data( 'autoEllipsis.originalText' ) ) {
$el.data( 'autoEllipsis.originalText', $el.text() );
} else {
$el.text( $el.data( 'autoEllipsis.originalText' ) );
}
}
// container element - used for measuring against
var $container = $el;
// trimmable text element - only the text within this element will be trimmed
var $trimmableText = null;
// protected text element - the width of this element is counted, but next is never trimmed from it
var $protectedText = null;
if ( options.hasSpan ) {
$trimmableText = $el.children( options.selector );
} else {
$trimmableText = $( '<span />' )
.css( 'whiteSpace', 'nowrap' )
.text( $el.text() );
$el
.empty()
.append( $trimmableText );
}
var text = $container.text();
var trimmableText = $trimmableText.text();
var w = $container.width();
var pw = $protectedText ? $protectedText.width() : 0;
// Try cache
if ( options.matchText ) {
if ( !( text in matchTextCache ) ) {
matchTextCache[text] = {};
}
if ( !( options.matchText in matchTextCache[text] ) ) {
matchTextCache[text][options.matchText] = {};
}
if ( !( w in matchTextCache[text][options.matchText] ) ) {
matchTextCache[text][options.matchText][w] = {};
}
if ( options.position in matchTextCache[text][options.matchText][w] ) {
$container.html( matchTextCache[text][options.matchText][w][options.position] );
if ( options.tooltip ) {
$container.attr( 'title', text );
}
return;
}
} else {
if ( !( text in cache ) ) {
cache[text] = {};
}
if ( !( w in cache[text] ) ) {
cache[text][w] = {};
}
if ( options.position in cache[text][w] ) {
$container.html( cache[text][w][options.position] );
if ( options.tooltip ) {
$container.attr( 'title', text );
}
return;
}
}
if ( $trimmableText.width() + pw > w ) {
switch ( options.position ) {
case 'right':
// Use binary search-like technique for efficiency
var l = 0, r = trimmableText.length;
do {
var m = Math.ceil( ( l + r ) / 2 );
$trimmableText.text( trimmableText.substr( 0, m ) + '...' );
if ( $trimmableText.width() + pw > w ) {
// Text is too long
r = m - 1;
} else {
l = m;
}
} while ( l < r );
$trimmableText.text( trimmableText.substr( 0, l ) + '...' );
break;
case 'center':
// TODO: Use binary search like for 'right'
var i = [Math.round( trimmableText.length / 2 ), Math.round( trimmableText.length / 2 )];
var side = 1; // Begin with making the end shorter
while ( $trimmableText.outerWidth() + pw > w && i[0] > 0 ) {
$trimmableText.text( trimmableText.substr( 0, i[0] ) + '...' + trimmableText.substr( i[1] ) );
// Alternate between trimming the end and begining
if ( side === 0 ) {
// Make the begining shorter
i[0]--;
side = 1;
} else {
// Make the end shorter
i[1]++;
side = 0;
}
}
break;
case 'left':
// TODO: Use binary search like for 'right'
var r = 0;
while ( $trimmableText.outerWidth() + pw > w && r < trimmableText.length ) {
$trimmableText.text( '...' + trimmableText.substr( r ) );
r++;
}
break;
}
}
if ( options.tooltip ) {
$container.attr( 'title', text );
}
if ( options.matchText ) {
$container.highlightText( options.matchText );
matchTextCache[text][options.matchText][w][options.position] = $container.html();
} else {
cache[text][w][options.position] = $container.html();
}
} );
};
} )( jQuery );
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